Hi –
Was experiencing same issue with header transparency not animating to a standard header (colored logo and solid white background) on scroll and mobile menu not working (did not try search). When I clicked on the link to see the other issues, found the ‘Performance’ Options suggestion. I did have both CSS and Javascript file merging Enabled. I Disabled Javascript only and the header and mobile menu both work now.

Thanks for a great theme and this forum! Hope this helps,
Brian